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<h3 id="切换版本"><a href="#切换版本" class="headerlink" title="切换版本"></a>切换版本</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">sudo update-alternatives --install /usr/bin/python3 python3 /usr/<span class="built_in">local</span>/bin/python3.7 1</span><br><span class="line">sudo update-alternatives --install /usr/bin/pip3 pip3 /usr/<span class="built_in">local</span>/bin/pip3.7 1</span><br></pre></td></tr></table></figure>
<h3 id="切换之后终端打不开"><a href="#切换之后终端打不开" class="headerlink" title="切换之后终端打不开"></a>切换之后终端打不开</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">cd</span> /usr/lib/python3/dist-packages/gi/</span><br><span class="line">sudo cp _gi_cairo.cpython-36m-x86_64-linux-gnu.so _gi_cairo.cpython-37m-x86_64-linux-gnu.so</span><br><span class="line">sudo cp _gi.cpython-36m-x86_64-linux-gnu.so _gi.cpython-37m-x86_64-linux-gnu.so</span><br><span class="line">sudo cp -a /usr/lib/python3/dist-packages/gi /usr/<span class="built_in">local</span>/lib/python3.7/site-packages/</span><br></pre></td></tr></table></figure>
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<h3 id="update-alternatives-基本命令"><a href="#update-alternatives-基本命令" class="headerlink" title="update-alternatives 基本命令"></a>update-alternatives 基本命令</h3><p>update-alternatives命令的几个主要选项为：display、install、remove、config</p>
<h4 id="display选项"><a href="#display选项" class="headerlink" title="display选项"></a>display选项</h4><p>display选项用来显示一个命令链接的所有可选命令，即查看一个命令链接组的所有信息，包括链接的模式(自动还是手动)、链接priority值、所有可 用的链接命令等等。</p>
<h4 id="install选项"><a href="#install选项" class="headerlink" title="install选项"></a>install选项</h4><p>install选项的功能就是增加一组新的系统命令链接符。<br>使用语法为：update-alternatives –install <link> <name> <path> <priority> [–slave link name path]…。其中link为系统中功能相同软件的公共链接目录，比如/usr/bin/java(需绝对目录); name为命令链接符名称,如java；path为你所要使用新命令、新软件的所在目录；priority为优先级，当命令链接已存在时，需高于当前值，因为当alternative为自动模式时,系统默认启用priority高的链接；–slave为从alternative。</p>
<h4 id="config选项"><a href="#config选项" class="headerlink" title="config选项"></a>config选项</h4><p>config选项用来显示和修改实际指向的候选命令，为在现有的命令链接选择一个作为系统默认。</p>
<h4 id="remove选项"><a href="#remove选项" class="headerlink" title="remove选项"></a>remove选项</h4><p>remove选项的功能是删除一个命令的link值，其附带的slave也将一起删除。<br>使用语法为:update-alternatives –remove name path。其中name与path与install中的一致，如果所删除的链接组中还有其他链接的话，系统将会自动从其他中选择一个priority高的链接作为默认为链接。<br>比如：update-alternatives –remove java /usr/lib/jvm/jre1.6.0_20/bin/java</p>
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